Improvement in machines for making metal screws



2Sheets--SheetlI A. W. GIFFURD. Machine for Making Metal Screws.

Patented Sept. 28,1875.

D Wa e d ed N. PETERS, FNOTD-LTHUGRAPHER. WASHINGTON, D. C.

`2Sheets.She et2. A. w. G lFrun. `Machinufor Making Metal Screws.

Patented Sept. 28', |875.

LPTERS. PHUTO-IJTMOGRAPHER. WASHINGTON. D 24 the three,

UNITRDSTATRS PATENT errer ALBERT w. G'IRFORD, 0F woRcRsTRR, MAssAcHUsRTTs.

IMPROVEMENT IN MAcHlNEsFoRMAKlNG METAL sczREws.

1 Specification forming part of Letters Patent No. 168,150, dated September 28, 1875; application filed September 9,1875.

To all whom it may concern:

Beitknown that I, ALBERT W. GIFFORD, p of the city and county of Worcester and State of Massachusetts, have invented a new and useful Machine for Making Screws; and do j hereby declare the same tovbe fully described' in the following specification and represented inthe accompanying drawings, of which- `Figure 1 is a top View, Fig. 2 afront elevation, Fig.-3 a longitudinal section, Fig. 4 a

rear elevation, and `Figx5 la transverse sec4 tion, of it.

`My invention, in themain, consists in the combination of a rotary head and its sets of jaws with a series of `arbors -arranged to operate witlisuch head, and provided with tools each set being furnished with a screw, a2, for

forcing one of its jaws toward the other, or away therefrom, as circumstances may require. There is iixed on the arbor B, which is supported in standards f f of a frame, C, an adjusting disk or wheel, D, having as many holes g g in it as there are sets of jaws at equal distances asunder, a spring-bolt,h, arranged as shown, serving, when in either of the saidholes, to confine the head in position. To co-operate with the rotary head there is, as represented, a series of arbors, E F Gr, supported in standards i i, they being arranged opposite three of the sets of jaws, which, instead of being disposed in one side ofthe rotary head, may be inits periphery, in which case the several arbors should beY arranged in radial directions with said head; but this I do not consider' so good an arrangement of the said parts as that shown by the accompanying drawings. To the inner end of the arbor Gr, which is the upper of the there is iixed a tool, k, for cutting a screwthread on a blank, there being fixed to the lowest arbor a tool, Z, for milling or shanking the blank-that is, for reducing it, so as to makeit withashank or bodythe part held in the jaws being the head, which, like a common screw-head, may be nicked diametrically.

The middle arbor F carries a tool, m, for pointing the blank.

While the machine is in operation, the set of jaws nearest the attendant is being supplied *with a blank, each ofthe other sets having a blank in it. yIn the meanwhile one of such blanks is being reduced so as to form a shank Vin it, the other being pointed, and the third being threaded. These operations having been completed, the attendant next is to revolve the cutter-head ninety degrees of a circle, and remove the finished screw, and supply its jawsy with a fresh blank.' While he is doing this each of the other blanks will be operated on, one being milled, the next being pointed, and the third threaded. The arbor G, carrying the threading-tool, has upon it a sleeve, m', provided with two pulleys or wheels, n o, applied to it so as to revolve on it, but without being capable of being moved endwise independently of the said sleeves. There is a stud, p or q, projectingfrom the hub of each ofthe said wheels, and there are also two studs, o" s, extending radially from the arbor Gr. From the middle of the sleeve m1 an arm descends, and pivots to a lever, t. The wheels n o, by belts, are to be revolved in opposite directions. On taking hold of the hand-lever tand moving it so as to slide the sleeve endwise on the arbor, one of its wheels may be clutched thereto, vso as to revolve the arbor in a direction to cause the threading tool to advance on and cut a thread on the screw-blank, which, having been done, the lever is to be moved in an opposite way, so as to clutch the other wheel with the arbor, and thereby cause it to revolve in a manner to run the threading-tool back and off the blank. The lowermost arbor E has upon it a sleeve or concentric tubular shaft, u, connectedwith it in such manner as to cause the sleeve, whilebeing revolved, to revolve the arbor, with the latter free to move endwise or longitudinally in the sleeve. Furthermore, there is xed on the sleeve a drivin g-wheel, o, and a grooved pulley, w. An endless band, w, goes around the said pulley w, and another pulley, y, on a shaft, z, provided with a screw, a3. A worm-gear, b2,

fixed on a transverse shaft, o2, engages with the said screw, there being on theshaft a pine', hung upion, d?, that engages with a rack,

on the arbor E, and between shoulders f g" thereof. Thearbor should be capable of revolving freely in the rack. The pulleys w y, band w, shafts z c2, screw a3, worm gear b2, gear d2, and rack e constitute a mechanism for feeding the arbor E forward toward the rotary jawed head. The shaft z turns, near its inner end, in a lever, h', supported in and pivoted to a bracket, z". This lever has projecting upward from it a spring-latch, k', to operate with an adjustable escapement, l. Fig. 6 is an edge elevation of the said latch, while Fig. 7 is a side view, and Fig. 8 an edge View, of the escapement. -The latter is acylinder, which turns on the shaft c2, and is furnished with-a setscrew, m2, to clamp it thereto. The latch has a small stud, a', extended from it. When the lever h is at its highest position the stud n', by bearing against the inner side of the escapement, causes thelever to be held in such position. In the periphery of the escapement is a notch, o', opening out of the escapement,^

as shown at p and g. On completion of the milling or shanking of the blank the notch o will have been moved around, so that the stud n' can enter it. On such taking place, the lever and the shaft supported by it will drop down, so as throw the screw a3 out of engage ment with the worm-gear bz( The attendant can next, bytaking hold ofthe worm-gear and revolving it, cause the arbor E to be retracted, which being accomplished, he is next to raise up the lever k', so as to throw the stud into engagement with the worin-gear. On the shaft c2 there is xed a cam, r',

against Whose periphery the lower arm of a forked level', s',

bears, such lever being made to `embrace the arbor F between` the shoulders u 'o' thereof'. A spring, w', serves to draw the lever up to the cam, and aid in effecting retraction vof the arhave pointed a blank. said arbor is a sleeve, carrying a bor after its tool may On the gear, y', that engages with a pinion, z, xed

` on the sleeve u. Such arbor and sleeve w should have a spline or feather connection.

While the machine may be in operation it will millor shank a blank` point another, and thread a third while one set of the jaws of the rotary head is having its screw removed, and a fourth blank substituted. In some cases the pointing-arbor and its tool and operative mechanism .may be omitted, in which .case the machine would both mill and thread a blank.

I claim as my inventionl. The rotary head A, provided with sets of jaws, as described, incombination with a series of two or more arbors, E F Gr, arranged to operate with such head, and furnished with tools, vas described, to effect simultaneously the operations of milling or shanking a screwblank, and pointing or cutting a thread on an other, while an attendant may be in the act of removing a finished screw from one set of the jaws of the head and substituting a blank for such screw, the said arbors being provided with mechanism for operating thein, as specified.

2. The combination of the latch k and the escapement l', as constructed and arranged in manner substantially as specified.

3. The combination of the latch lc and escapement l', as described, with the lever and the feeding mechanism, as described, of the' arbor E, such feeding mechanism consisting of the pulleys w y, banda', shafts z c2, screw a3, worm gear b2, gear d2, and rack e', all being arranged as shown and explained.

4. The combination of the sleeve m' and the studs p q rs with the two pulleys n o, and the threading-arbor G, all being applied and to operate as specified. v

ALBERT W. GIFFORD.

Witnesses:

R. H. EDDY, J. R. SNOW. 

